I also didn't focus on the clues that much I was happy with no Britney in the contest and I was blinded by ABBA's pic 2The meaning behind the clues, if you didn't understand them, were:
There was a picture of Britney Spears from her "Baby One More Time" music video. And the name of the group is of course, One More Time.
The second picture was of ABBA. Peter Grönvall (the male member of One More Time) is the son of Benny Andersson, who was in ABBA.